Microsoft’s free upgrade offer for Windows 7 and Windows 8.1 users ended a few years ago, but you can still technically upgrade to Windows 10 free of charge. While Microsoft has removed the special upgrade offer sites, the company continues to activate Windows 10 licenses for people who upgrade from Windows 7 or Windows 8.1.

The most important thing to remember is that the Windows 7 to Windows 10 upgrade could wipe your settings and apps. There’s an option to keep your files and personal data, but because of differences between Windows 10 and Windows 7, it’s not always possible to keep all of your existing apps. Make sure you’ve noted what apps you use regularly so you can easily obtain them by downloading the installers again. Windows 8.1 can also be upgraded the same way, but without needing to wipe your apps and settings.

Here’s how to upgrade from Windows 7 to Windows 10:

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